Process of preventing the inner walls of rubber hose from sticking during manufacture



v, ,UNITED STATES PATENT OFFICE...

FRANK C. MOORE, OF CANTON, OHIO.

PROCESS OF PREVENTING THE INNER WALLS OF RUBBER HOSE FROM STIOKIN G DURING MANUFACTURE. g

No Drawing.

1T0 all whom may concern.

a. citizen of the United States, residing at Canton, county of Stark, and State of Ohio, have invented certain new and useful Improvements in Processes of Preventing the Inner Walls ofRubber Hose from Sticking DuringManufacture, of. whichthe followin isa specification. i

' y invention relates to improvements in processes for manufacturing high grade rubber hose, and it consists in the steps hereinafter set forth. An object of my invention is to provide a process by means of which the difficulties in manufacturing the inner rubber core or the sticking together tube which arise-from of the parts of the uncured core or tube, are obviated.

. A further object of my invention is to provide a process by means of which the uncuredcore or tube after being formed, and

. before being braided, i. 6., covered with fabric, may be economically treated so that after such treatment the uncured core or tube may be left for any length of time without any danger of the inner walls of the tube sticking together, should the tube become compressed for any reason, or of the outer walls of adjacent coils or portions of the tube sticking together, should they come in contact with one another.

A" further object of my invention is to provide a process by means of which the sticking together of the parts of the uncured tube may be prevented, while permitting the tube to be braided at any desired time.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particu-, larly pointed out in the appended claims.

In the making of high grade rubber hose, an inner core or tube of relatively pure rubber is used. It is exceedingly diflicult to prevent the inner walls of the tube from belng permanently joined together through the accidental compression of the tube, for when the two raw rubber surfaces come in contact they adhere firmly, and such sections of the tube must of necessity, be discarded. The same thing is true of the outer walls of adjacent sections of the tube which come in contact with one another.

Various attempts have been made to rem- Specification of Letters Patent.

sults in expanding Patented June 22,1920.

Application filed December 21, 1918. Serial No. 267,819.

be left for a longer time than that before it is braided. VVhen the effect of the water wears off, the same difficulty is experienced as before.

It has also been proposed to blow dered limestone by means of air. found that the blown in by air, few feet until the pow- In practice, however, it is powdered limestone when will penetrate only for a inner bore of the tube is completely clogged. Furthermore, the use of compressed air in forcing the limestone dust into theinterior of the tube, often re the tube out of shape, so that it cannot be used. The present invention is designed to obviate these difficulties.

In carrying out my invention I makeuse of a mixture of powdered soapstone and water. The proportions of this mixture may vary, but I have found in practice that ten parts of water to one part of. powdered a mixture which works ad mirably. This mixture has the consistency of milk. Any suitable means of introducing the liquid into the interior of the tube may be used. by gravity, or-force it in under pressure. The mixture being perfectly fluid, of course, will not clogup the interior of the tube in the manneriin which dry, powdered limestone will clog it up.

When it is desired and the exterior of the tube, the tube may be coiled in any suitable receptacle containing the fluid mixture, the latter being preferably kept in a state of agitation by any suitable means, such as by forcing compressed air into the liquid.

The tube thus treated may be left in the fluid mixture until such time as it is desired soapstone forms to braid the tube, or the tube may be re into the interior of the tube Thus I may runthe liquid in to treat the interior 1 vulcanization.

pressed, or the adhesion of the outer walls of the tube when in contact with adjacent portions or coils.

In braiding the tube prior to the curing or vul :anizing ot' the rubber portions of the hose, it is, of course, necessar 1 to remove the soapstone deposit in order to secure perfect This may be done in a number of ways; it may be washed off with water or other suitable cleansing'agent, or if the tube has been previously drained and the deposit of soapstone is dry, it may be blown oif by Compressed air, or other suitable gas. It the tube is washed with water, it must be dried before the braiding is applied. By the use or compressed air, the removal of the soapstone deposit on a wet tube, and the simultaneous drying of the tube may be efi'ected. Any suitable apparatus may be employed for this purpose. .he braiding of the tube and the subsequent completion thereof may be accomplished in the ordinary manner, as by running a braid of cotton threads and then spreading over this a thin coating of rubber knownto the trade asfrictio11,wi tl1 alternate layers of braiding and friction until the proper size and strength acquired. After the tirstbraid is applied, the-tube is inflated with air to a certain specified diameter, the ends are sealed up and the subsequent operations are carried out on the inflated. tube. After the exterior cover has been applied the hosethus formed is cured in a specially designed press by steam, and the different layers are thus formed into one solid wall.

It will be understood that this process is intended especially for high grade rubber hose. The lower grades of hose generally have cores or inner tubes not made of rubber, but oi rubber ;-ompositions which do not have the adhesive properties of pure rubber, and which, therefore, are not subject to the difficulties encountered in the manu-.

facture of the products of high grade.

\Vhile I have specified powdered soapstone water as being the active agents for the purpose described, it will be understood that myinvention contemplates ner and outer walls of an uncured inner tube,

a mixture'of water and a 'powderedagent capable of being deposited, upon the walls of the tube and preventingthe adhesion of said walls. 7

2. The herein described steps in the manufacture of high grade rubber hose which consists in applying cured inner tube, a mixture of water and a powdered agent capable of being deposited upon the walls of the tube and preventing the adhesion of said walls, and subsequently 7 driving oft the water and removing the deposit.

The herein described steps in the manufacture of high grade rubber hose which con sists in applying to the walls of anuncured to the walls of anuninner tube, a mixture of water and apowdered agent capableor' being deposited upon the walls. of the tube and preventing the adhesion of said walls, subsequently drivinglofi the water and removing the deposit, braiding the tube, applying alternate l'ayers of rubber and braiding,.and finally vulcanizing the rubber. a a

4. The herein described steps in themanufacture of high grade rubber hose which consists in applying to the walls of an uncured inner tube, amix tureot water and powdered soapstone capable of being deposited upon the walls of the tube and preventing the adhesion of said walls, subse quently driving off the water, and'removing the deposit, braid" 1g the tube, applying alternate layers .olrubber and braiding, and finally vulcanizing the rubber.

. FRANK o. Moons. 

